div {
  height: 20px;
  width: 20px;
  top: 20px;
  margin: 20;
}
div {
  height: 0px;
  width: 10px;
  top: 10px;
  padding: 10;
}
div {
  height: 100px;
  width: 100px;
}
div {
  height: 10px/5;
  height: 2px;
  width: 2px;
}
